package cn.tedu.boot02.controller;

import cn.tedu.boot02.entity.Product;
import cn.tedu.boot02.utils.DBUtils;
import org.springframework.stereotype.Controller;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.ResponseBody;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.util.ArrayList;

@Controller
public class ProductController {
    @RequestMapping("/insert")
    @ResponseBody
    public String insert(Product product){
        System.out.println("product = " + product);
        try (Connection conn = DBUtils.getConn()){
            String sql = "INSERT INTO product VALUES(NULL,?,?,?)";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "添加成功!";
    }

    @RequestMapping("/select")
    @ResponseBody
    public String select(){
        ArrayList<Product> list = new ArrayList<>();
        try (Connection conn = DBUtils.getConn()){
            String sql = "SELECT * FROM product";
            PreparedStatement ps = conn.prepareStatement(sql);
            ResultSet rs = ps.executeQuery();
            while(rs.next()){
                //取出查询到的商品信息并封装到对象里面
                Product product = new Product();
                product.setId(rs.getInt(1));
                product.setTitle(rs.getString(2));
                product.setPrice(rs.getDouble(3));
                product.setNum(rs.getInt(4));
                list.add(product);//把商品对象装进集合
            }
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        String html = "<table border='1'>" +
                "<caption>商品列表</caption>" +
                "<tr><th>id</th><th>标题</th><th>价格</th><th>库存</th><th>操作</th></tr>";
        //遍历集合
        for (Product p:list) {
            html+="<tr>";
            html+="<td>"+p.getId()+"</td>";
            html+="<td>"+p.getTitle()+"</td>";
            html+="<td>"+p.getPrice()+"</td>";
            html+="<td>"+p.getNum()+"</td>";
            html+="<td><a href='/delete?id="+p.getId()+"'>删除</a></td>";
            html+="</tr>";
        }
        html+="</table>";
        return html;
    }
    @RequestMapping("/delete")
    @ResponseBody
    public String delete(int id){
        System.out.println("id = " + id);
        try (Connection conn = DBUtils.getConn()){
            String sql = "DELETE FROM product WHERE id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setInt(1,id);
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "删除完成!<a href='/select'>返回列表页面</a>";
    }

    @RequestMapping("/update")
    @ResponseBody
    public String update(Product product){
        System.out.println("product = " + product);
        try (Connection conn = DBUtils.getConn()){
            String sql = "UPDATE product SET title=?,price=?,num=? WHERE id=?";
            PreparedStatement ps = conn.prepareStatement(sql);
            ps.setString(1,product.getTitle());
            ps.setDouble(2,product.getPrice());
            ps.setInt(3,product.getNum());
            ps.setInt(4,product.getId());
            ps.executeUpdate();
        } catch (SQLException throwables) {
            throwables.printStackTrace();
        }
        return "修改完成!<a href='/select'>返回列表页面</a>";
    }
}
